What are Functions?
Think about a function as a vending machine. You give the function an input value (the code you type in) and it assigns you an output (candy, pretzels, etc.). If you enter the same input code the next time, it should give you the exact same output that it gave you the last time.
Representing FunctionsThere are several different ways to represent a function. Mapping diagrams use ovals and arrows to show how the inputs and outputs are matched up. You can also use tables, graphs, or a set of ordered pairs to represent a function.

